性能の変動性は",結晶化"した成鳥の歌の適応的な可塑性を可能にします
Evren C Tumer1, Michael S Brainard
1Keck Center for Integrative Neuroscience, Sloan-Swartz Center for Theoretical Neurobiology, Department of Physiology, University of California, San Francisco, California 94143-0444, USA. evren@phy.ucsf.edu
Nature
|December 22, 2007
まとめ
成鳥の鳴き声における運動の変動は,ランダムなノイズではなく,継続的な学習のメカニズムである. ベンガルのフィンチは,聴覚障害を避けるためにリアルタイムで彼らの歌を適応させ,複雑な運動スキルの試行錯誤学習を示しました.
科学分野:
- 神経科学は神経科学である.
- 動物の行動 動物の行動
- バイオアコースティクス バイオアコースティクス
背景:
- 運動スキルは,試験ごとに変化を示し,しばしばノイズとみなされます.
- 別の仮説では,この変動性が,試行錯誤による学習を容易にするという.
研究 の 目的:
- 成鳥の鳴き声の変動が適応学習をサポートするかどうかを調査する.
- 性能の最適化のためにモーターのバリエーションが利用されているかどうかを判断する.
主な方法:
- 大人のベンガル・フィンチの歌声は,コンピューターシステムを使用して監視されました.
- 対象となる曲の要素の微妙なピッチの変動に対して,リアルタイムの聴覚障害が適用されました.
- 聴覚フィードバックに対する声の反応を分析した.
主要な成果:
- 鳥は,聴覚障害を避けるために,声のピッチを迅速かつ適応的に調整しました.
- ボーカルの変化は,対象となる曲の特徴に特異的であった.
- これは,声の変異を異なる結果と関連付けることで学習することを示しています.
結論:
- 鳥の鳴き声のような学習された運動スキルの残留変動はノイズではなく,継続的な学習をサポートします.
- このメカニズムは,性能の最適化とモーターシステムの変化への適応を可能にします.
- 発見は,スキルの維持と精錬におけるモーターの変動性のより広範な役割を示唆しています.
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